diff --git a/libstdc++-v3/testsuite/17_intro/names.cc b/libstdc++-v3/testsuite/17_intro/names.cc
index 3cbe0d2da54..b0cc21d6cda 100644
--- a/libstdc++-v3/testsuite/17_intro/names.cc
+++ b/libstdc++-v3/testsuite/17_intro/names.cc
@@ -287,4 +287,14 @@
 
 #endif // __VXWORKS__
 
+#ifdef _WIN32
+#undef Value
+// <stdlib.h> defines _CRT_FLOAT::f
+#undef f
+// <stdlib.h> defines _CRT_DOUBLE::x and _LONGDOUBLE::x
+#undef x
+// <math.h> defines _complex::x and _complex::y
+#undef y
+#endif
+
 #include <bits/stdc++.h>